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Product size: The product has an outer diameter of 40mm, an inner diameter of 20mm, and a height of 12mm. Manual measurements, please allow slight errors. Applicability: The product is suitable for transmission products, linear modules, engraving machines and various precision instruments. Product features: strong locking force, high precision, good lubricity, and smooth use. Easy to install: It can be directly replaced without adjustment, with perfect compatibility and high reliability. Product material: The product is specially designed and made of aluminum alloy, with a long service life and not easy to damage.